Question

Length of the rectangle is reduced by 10% and breadth increased by 20%.The area of rectangle will be

Answer 1

original length = a

original breadth = b

area = ab

new length = a x 90/100 = 90a/100 = 9a/10

new breadth = b x 120/100 = 12b/10

new area = 9a / 10   x   12b/10  = 108ab/100  ie. 108/100  x ab

So area of rectangle will be 108/100 of original rectangle

            or

let take original length = 10

breadth = 10

area = 100

new length = 10 x 90/100 = 9

new breadth = 10 x 120/100 = 12

area of rectangle will be = 9 x 12 = 108

so area of rectangle wll be 108 which is 8 more than original area